This ultra quiet fountain provides fresh flowing filtered water for your pet. The flowing water naturally reduces bacteria and keeps water cooler. The reservoir automatically adds water as needed. Deluxe Fresh Flow Purifying Pet Fountain features: translucent reservoir for water monitoring, two replaceable charcoal filters for removing contaminants, flow control lever, specially designed ramp to reduce splashing and keep the water flow ultra quite, non-skid rubber feet, and an On/Off switch with low voltage safety system. Available in large 108 oz. capacity, and jumbo size capacity of 216 oz. Great for large pets or multiple pets!